Abrasive device



Dec. 3, 1935. .L L BALL/LSL; EL AL 2,023,041

ABRASIVE DEVICE Filed April 16, 1935 701 40d, @f @wf BY Pw/z. BUCHE/,575

jim/@MM @m ATTORNEYS Patented Deci',` 1935 I I UNITED STATES PATENT OFFICE ter. Tiilln, 0hio assignorse to TheV Sterling Grinding Wheel- Company, Timu, Ohio, 4a coru poration of Ohio Application April 16, 1935, SerialNo'. 16,637

9 Claims. (Cl. 51-209) This invention relates to an abrasive device and particularly, to improvedmeans for securing the abrasive member or members in a chuck or other holder.

In another aspect, the invention relates to the abrasive member pe'r se whlch'hasy a novel construction to permit the use andfunctionof the :gilding or securing means for the abrasive mem- The principal object of the present invention is to provide an abrasive device which in general is less expensive than prior devices of Athis kind and more practical and satisfactory in operation.

More particularly it is the aim of the invention to provide an abrasive device, including a chuck and the abrasive .member or .members such as segments arranged Aend to -end, which can be readily mounted on the rotary member of a grindf' quickly accomplished, wherein the abrasivev members are scheld in place that they will not accidentally come loose, whereinthe chuck or holder is lighter in Weight than heretofore, and Awherein the chuck has a relatively small overhang or lateral' projection beyond the outer face orv surface of the abrasive members.

Still further' the invention aims to provide a; holding means such that a greater percentage of the abrasive member can be used than heretofore. The invention may be here briey summarized as consisting incertain novel combinations and arrangements of parts which will be describedin the specication and set forth in the appended claims i In the accompanying sheet of'drawings.v

' e Fig. 1 is a side view of my improved grinding device;

vof abrasive members-which may be employed to advantage. f'

'Referring now to the drawing, the abrasive de-V l vice includes a holder which in this instance l(though not necessarily) is inthe form of an chuck III having an inwardly extending body portion Illa and-a lateral segment-holding wall |06. The'wall Illb isin the form of a ilange yface IIlc which is at right angles to the inner or the position it occupies when so mounted, but it 5 will be understood, of course, that it may be mounted to rotate about an axis which extends in some oth'er direction. The chuck may be secured to the rotary element of the grinding machine inany suitable manner, but generally it is l0 bolted'thereto, in which case the chuck will be Aprovided with a suitable number of circumferentially spaced tapped bolt openings one of which is shown at Illf in Fig. 3.

The abrasive member is in this instance annu- 15 lar or cylindrical in formand'is generally composed of segments II the vertical edges of which may be interlocked as shown at IIa. in Fig. 2, although, as. will be pointed out subsequently,

'this is not an essential feature. The abrasive 20 member or the segments composing it are iitted into and initially held in the holder in the manner clearly shown in Fig. 3, with the upper edges of the segments engaging thev under face of the body IIla of the chuck and with a portion ofthe outer cylindrically curved surfaces of the segments engaging the clamping face IIlc of the lateral wall or i'lange`lllb of the chuck. They are held in this position by a segmental clamp I2 which engages a portion of the inner cylindrical surfaces of the segments II and by clam-ping bolts I3 the arrangement of which will be described below.

yBy rference to Fig. 3 it is to be noted that the upper edges of the clamping segments I2 are' on 35 a taper and that they engage a similarly tapered' or inclined surface I4 formed on the underv side of the chuck body Illa.. Likewise, it will be obf served that the bolts |13 are diagonally arranged with respect to the chuck, clamping segments I2, 40

and abrasive segments II, these bolts having thesame angle of inclination as the angle of the engaging tapered or inclined faces I4 ofthe clamp segments and chuck body Illa. This will be obvious from an inspection of Fig. 3. Likewise 45 it will be observed that the outer'annular face of the chuck, as viewed in Fig. 1, has an upperportion which is beveled inwardly as shown at- I0d,

and that the outer upper portion of the chuck IIld, upwardly facing U-shapedvnotches I 0e tlie inner faces of which are fiat and are at right angles'to the axis of the clamping bolts I3. Fromthis sameilgureit will be seen that the clamping bons la have their heads Isa seated 1n these 55 V the segment tothe other and of increasing depth from the outer to the inner surface of the segment, the bottom of the slot being inclined down-v wardlyand inwardly at an angle corresponding to the angle of inclination of the bolt and of the engaging tapered faces of the clamp segments and the under side of the chuck body. I This angle can be varied as found'desirable, but-we iind that an angle of about 11 gives excellent results.

In practice, when a segmental abrasive member is employed, there will generally be one clamping `segment for each abrasive segment andone clamping bolt for each pair of abrasive and clamping segments, in which event the clamping bolt for each clamping segment will engage the segment midway between its ends and the open slot IIb in each abrasive segment will be midway between the upright edges. However, We do not regard this arrangement as being vital to the invention for, in some instances, the abrasive member may be in one solid piece, as will be subsequently pointed out, but even when the segal mental abrasive member is employed we do not regard it essential that there be the same number of abrasive segments as clamping segments,v

although that arrangement is preferred. If the abrasive member is in one piece instead of segmental, or` if the segments are of considerable length circumferentially considered, a plurality of bolts I3 will pass through it, in which event it will obviously have a plurality of the tapered transverse slots IIb, i. e., one for each bolt.

When the abrasive member is placed in the chuck or holder, as shown, and when the clamping bolts I3 are tightened, the action of the lnclined bolts and of the inclined engaging faces of the clamps with the under side of the chuck body Iis to cause the clamps to be moved not only outwardly but also upwardly along the tapered surfaces I4, with the result-that the clamps not only clamp the segments against the inner suror becoming loose.

A very important advantage of this construction resides in the fact that a deep clamping surface on the chuck and clamps is not-necessary, with the result that all but a smalll portion of the segments can be used for grinding purposes, in fact we find in practice that after. a substantial portion of the segments has been worn away by the abrasive action lso that the working faces or edges of the segments approach the chuck, the clamping bolts can be loosened slightly and the segments lowered so that nally the actual amount of the segments which extends into the segment receiving channel of the chuck or holding means, and therefore the portion which cannot be'used, is very small indeed. This downward adjustment of the segments in the manner just explained is made lpossible by reason of the factvthat neither side of the holding portions of the segments is beveled, but, on the other hand, the inner and outer' surfaces which engage the chuck ange and clamps, respectively, are a uniform distance apart.

We have previously mentioned that the abral sive member may be in one piece instead of segmental. This we have illustrated at I Ic in Fig. 5. We have also mentioned the fact that the upright adjacent edges of the segments need not be interlocked. If the upright edges engage,`the 10 engaging edges may be flat. Furthermore, it is not necessary that the edges 'engage each other. The gaps between the segments may be radial, as shown in Fig. 6, where the segments are designated I Id and the radial gaps between them IIe, l5 or they may be other than radial or somewhat tangential, as shown in Fig. '1, where the segments are designated I I f and the non-radial gaps between them are designated Iig. In the two latter cases where the segments are spaced apart, 21.).

the clamping bolts andthe tapered slots,in the segments locate or position the segments so as to maintain them a substantially uniform distance apart and'thus keep the wheel in balance.

We might state also that while at the present 25 time we believe our invention has its principal utility in connection with an annular chuck or holder employing an annular solid or segmental abrasive member, the invention or certain phases of it may have utility in a non-circular holder 30 with a correspondingly shaped abrasive member.

It will be seen without further detailed explanation that all the objects and advantages set forth in the early part of the specication are attained by an abrasive device embodying the 35 present invention. Likewise, it will be apparent that the invention is susceptible of various modifications, and we therefore do not wish to be confined to the precise details or embodiments shown, but aim in our claims to cover all modiil- 40 cations and changes which do not involve a departure from the spirit and scope of the invention.

Having thus described our invention, we claim:

1. Anfabrasive .device comprising a holding 45 member and an abrasive member, the holding member having a base and a xed wall adapted to be engaged respectively by the inner edge and one side of the abrasive member, a clamp engaging the other side of said abrasive member, and 50 a clamping bolt extending between the clamp and the holding member and arranged diagonally with respect to the clamping walls so that the pressure exerted on the abrasive member by the clamp will have a component inwardly toward 55 the base of the holding member, the portion of the abrasive member which is adapted to be engaged by the fixed wall and the clamp being ot uniform thickness whereby the abrasive member is adjustable between the xed wall and the clamp in a direction away fromy the base.

2. An abrasive device comprising a chuck having a base' andA awall ilxed relative thereto, a clamp mounted for'movement toward said base .s as well as .toward said xed wall, an abrasive member arranged between said xed wall and said clamp, and means for drawing said clamp toward the abrasive member and toward the base so that the pressure exerted by the clamp on the 70 abrasive member has a component inwardly toward the base, .the portion of the abrasive member which is adapted to be engaged by the nxed `wall and the clamp being of uniform thickness tween the fixed wall and the clamp in a.l direction away from the base.

3. An abrasive device comprising a chuck having a base or body portion and a ange constituting a clamping wall, a clamp spaced from and arranged opposite said clamping wall and mounted for movement diagonally toward the-base and toward said clamping wall of the chuck body, an abrasive member between the clamping wall and the clamp, and a diagonally disposed bolt extending between the chuck and the clamp so that the pressure exerted on the abrasive member by the clamp has a component inwardly toward the base of the chuck, the portion of the abrasive member which is received between the flange and the clamp being of uniform thickness and the abrasive member being adjustable between the clamping wall and the clamp ina direction away from the base.

4.' An abrasive device comprising a chuck having a base and a lateral wall, a clamp arranged opposite said lateral wall, 'an abrasive member between the clamp and said wall, said base hav-I ing an inclined bearing surface for the clamp,

and means for drawing the clamp toward the lateral wall and toward the base along said inclined surface.

5. An abrasive device comprising a holder having a base portion and a lateral wall disposed angularly thereto, a clamp, an abrasive member adapted to be received between said lateral wall and said clamp, the base and inner portion of the clamp having engaging inclined surfaces, and means for moving the clamp toward the abrasive device and toward the base in the direction of said inclined surfaces.

6. An abrasive device comprising a holder with a base and a lateral wall, a clamp arranged oppo- Isite the lateral wall, there being adapted to be received between the lateral wall and the clamp an abrasive member, the base and clamp having engaging surfaces on a given inclination, and a 5 clamping bolt carried by the holder and engaging the clamp and having the same inclination as said surfaces.

y '1..An abrasive device comprising a chuck body having a base and an outer clamping wall, an inner clamp movable with respect to said wall, an abrasive member between said wall and clamp, the inner portion of the abrasive member having an open slot, and a diagonally disposed clamping bolt extending between said chuck body and `clamp through said slot so that the pressure exerted by the clamp on the abrasive member has a component inwardly toward the base, the portion' of the abrasive member between the said wall and the clamp being of uniform thickness and the abrasive member being adjustable between said wall and clamp away from the base.

8. An abrasive member for a segmental grinding wheel having two opposite arcuate side surfaces and an edge portion adapted to be received in a suitable holder, and an open slot extending transversely across said edge portion between said opposite arcuate surfaces.

9. An abrasive member for a segmental grindf, ing wheel having two opposite arcuate side surfaces and an edge portionadapted to be received in a suitable holder and a diagonal slot extending transversely across said edge portion between said opposite arcuate surfaces.

JOSEPH L. BALLASH. PAUL BUCHEISTER. 

